Freeze-thaw performance of concrete incorporating wood bottom ash as fine aggregate replacement

Anders Hedegaard Jensen; Carola K. Edvardsen; Lisbeth M. Ottosen

Freeze-thaw performance of concrete incorporating wood bottom ash as fine aggregate replacement

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Abstract

Alternative materials in concrete are needed to reduce the strain on environmental resources.
Wood bottom ash is presented here as a viable alternative aggregate for use in colder climates. Bottom ash (BA) from a wood fired Circulating Fluidized Bed (CFB) boiler is used to substitute natural sand in concrete. Concretes with substitution rates of 0%, 25% and 50% of sand are tested for freeze-thaw resistance. The relevant properties compared to natural sand are determined, showing similar properties. The best performing concrete has 25% BA. The results also reveal higher air content with increased BA content.

Original language	English
Publication date	2025
Number of pages	5
Publication status	Published - 2025
Event	XXVth Nordic Concrete Federation Symposium 2025 - Scandic Park, Sandefjord, Norway Duration: 19 Aug 2025 → 22 Aug 2025 Conference number: 25

Conference

Conference	XXVth Nordic Concrete Federation Symposium 2025
Number	25
Location	Scandic Park
Country/Territory	Norway
City	Sandefjord
Period	19/08/2025 → 22/08/2025

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Freeze-thaw performance of concrete incorporating wood bottom ash as fine aggregate replacement
Jensen, A. H. (Guest lecturer)
19 Aug 2025 → 22 Aug 2025
Activity: Talks and presentations › Conference presentations

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title = "Freeze-thaw performance of concrete incorporating wood bottom ash as fine aggregate replacement",

abstract = "Alternative materials in concrete are needed to reduce the strain on environmental resources. Wood bottom ash is presented here as a viable alternative aggregate for use in colder climates. Bottom ash (BA) from a wood fired Circulating Fluidized Bed (CFB) boiler is used to substitute natural sand in concrete. Concretes with substitution rates of 0\%, 25\% and 50\% of sand are tested for freeze-thaw resistance. The relevant properties compared to natural sand are determined, showing similar properties. The best performing concrete has 25\% BA. The results also reveal higher air content with increased BA content. ",

author = "Jensen, \{Anders Hedegaard\} and Edvardsen, \{Carola K.\} and Ottosen, \{Lisbeth M.\}",

year = "2025",

language = "English",

note = "XXVth Nordic Concrete Federation Symposium 2025 ; Conference date: 19-08-2025 Through 22-08-2025",

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TY - ABST

T1 - Freeze-thaw performance of concrete incorporating wood bottom ash as fine aggregate replacement

AU - Jensen, Anders Hedegaard

AU - Edvardsen, Carola K.

AU - Ottosen, Lisbeth M.

N1 - Conference code: 25

PY - 2025

Y1 - 2025

N2 - Alternative materials in concrete are needed to reduce the strain on environmental resources. Wood bottom ash is presented here as a viable alternative aggregate for use in colder climates. Bottom ash (BA) from a wood fired Circulating Fluidized Bed (CFB) boiler is used to substitute natural sand in concrete. Concretes with substitution rates of 0%, 25% and 50% of sand are tested for freeze-thaw resistance. The relevant properties compared to natural sand are determined, showing similar properties. The best performing concrete has 25% BA. The results also reveal higher air content with increased BA content.

AB - Alternative materials in concrete are needed to reduce the strain on environmental resources. Wood bottom ash is presented here as a viable alternative aggregate for use in colder climates. Bottom ash (BA) from a wood fired Circulating Fluidized Bed (CFB) boiler is used to substitute natural sand in concrete. Concretes with substitution rates of 0%, 25% and 50% of sand are tested for freeze-thaw resistance. The relevant properties compared to natural sand are determined, showing similar properties. The best performing concrete has 25% BA. The results also reveal higher air content with increased BA content.

M3 - Conference abstract for conference

T2 - XXVth Nordic Concrete Federation Symposium 2025

Y2 - 19 August 2025 through 22 August 2025

ER -

Freeze-thaw performance of concrete incorporating wood bottom ash as fine aggregate replacement

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Freeze-thaw performance of concrete incorporating wood bottom ash as fine aggregate replacement

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